Pump



Sept. 27, 1932. w. c. HARBlsoN PUMP Filed July 27. 1929 2 Sheets-Sheet 1 230 PI/'LLJAM CARL [nafsazv Sept. 27, 1932. w. c. HARBlsoN PUMP Filed July 27. 1929 2 Sheets-Sheet 2 Jmwnto /JLLMM CARL Mms/150A! Patented Sept. 27, 1932 UNITED STATES PATENT 'OFFICE WILLIAM CARL HABBIBON CAB COMPANY, F DETROIT,

0l' MICHIGAN appunti mea my a7, im. sam mi. amm.

This invention relates to pumps, and more particularly to gear pumps.

An object of the invention is to provide a fluid pump in which the delivered output is controlled.

Another object of the invention is to provide a fluid pump in which the rate of flow of the delivered output may be selected within a predetermined range without alteration of the m intake volume.

` Still another object of the invention is to provide a pump in which the rate of flow of the delivered output is selective and which will maintain the selective output constant during any given range of operating speed, within limits.

Another object of the invention is to provide a pump in which a portion of the intake is by-passed to control the delivered output.

Other objects of the invention will appear from the following description, taken in connection with the drawings, whi h orm a part of this specification, and in which:

Fig. 1 is a side elevation of a pump and a 25 supply tank connected thereto, the pump being shown partly broken away and partly in section,

Fig. 2 is a sectional view substantially on lines 2-2, Fig. 1,

Fig. 3 is a sectional lines 33, Fig. 1,

Fig. 4 is a sectional view substantially on lines 44, Fig. 2,

Fig. 5 is a sectional view substantially on 6 lines 5 5,Fig.2,

Fig. 6 is a modified form of the invention, illustrating a diierent means for adjusting the capacity of the pump,

o Fig. 7 is a sectional view substantially on lines 7-7, Fig. 6,

Fig. 8 is a sectional view substantially on lines 8-8, Fig. 6, and

Fig. 9 is a sectional 45 lines 9-9, Fig. 7.

Referring to the drawings or more specilie details of the invention, 10 represents, generally, the body of the pump. As shown, the body is built up with suitable plates 11, 12,

l0 and 13, super-imposed and secured together 30 view substantially on view substantially on by bolts 14, so that the joints between the p ates are rendered air tight.

The plate 11 has positioned therein a chamber 15 provided with a shoulder 16, the object'of which will hereinafter appear, and .communicating with the chamber is a pasl sage 17 leading to a pipe line 18, or a suitable sp1 ot. The chamber 15 also has communieating therewith a passage 19 leading to the outlet ort 20 of a pump mechanism 21 to be hereinafter described. A transverse bore 22 in which is positioned a bearing 23 is also provided in the plate 11.

The plate 12 is planed, or finished, to fit flush against the plate 11. The plate 12 has positioned therein three overlapping transverse bores 24, 25, and 26; one of which, the bore 26, registers with the chamber 15 and forms a continuation thereof; and another, the bore 24, is axially aligned with the bearing 23.

A ear 27 is positioned in the bore 24 and is suitably keyed to a driving shaft 28 positioned for rotation in the bearing 23. The bore receives a gear 29 which meshes with the gear 27 and the bore 26 receives a gear 30 which meshes with the gear 29.

The intake chamber 31 of the pump has communicating therewith a passa e leading to a pipe line 33 connecte to a source of supply, or, as shown, to a supply tank 34. The gears 27 29, and 30 are of uniorm thickness and of substantiallv the same thickness as the plate 12 so that there will be proper functional relationship between the gears and no perceptible leakage.

The gear 30 is axiall bored to receive a iston 35 having an en arged annular head 36 fitted for reciprocation in the chamber 15, and a reduced end portion 37 on which is threaded an annular member for retaining the ear 30 on the piston and providing a hea 38 corresponding substantially to the head 36, so that the piston, to all intents and purposes, is double headed. A longitudinally extending groove or cutaway portion 49 is provided 1n the side of the piston head 38 nearest the gear 29, which is adapted to register with the teeth on the gear 29 under certain conditions to be later described.

The plate 13 is planed to lit flush against the plate 12 and 1s provided with overlapping bores 39 and 40. he bore 39 registers with the bore 26 in the plate 12 and receives the annular member or head 38 which is fitted for reciprocation in the bore 39 to provide a compression chamber 41. A boss 42 is formed upon the plate 13 and this boss is bored to provide a chamber 43 communicating, as by a passage 44, with the chamber 41.

spring pressed ball valve 45 positioned in the chamber 43 is adapted to control the passage 44. As shown, a plug 46 is threaded in the chamber 43 to close the chamber and to provide means for regulating the tension of the spring for actuating the valve, and the chamber 43 is connected by a. pipe line 47 to the supply tank 34.

A plug 48 has a press fit in the bore 40 above the gear 29 and is sufliciently close to the gear to prevent leakage. This plug is provided with a duct 51 which leads from the intake chamber 31 upwardly and communicates with a passage 50 formed in the boss 42 and which opens into the chamber 41.

The pump gears are rotated through rotation of the shaft 28 in .the directions indicated bv the arrows in Fig. 1. Fluid from the tank 34 will pass through the ipc line 33 to the passage 32 and to the inta e chamber 31 and will be carried by the teeth of gears 27 and 29 around the adjacent wall of the chambers 24 and 25, each gear preferably carrying equal amounts in opposite directions. The fluid carried by gear 27 is conducted to the port 20 which leads to the chamber 15 so that one half of the maximum pump output is at all times in this manner conducted directly to the outlet 18.

The gear 29 carries its fluid to a s ace in the casing section 12 directly beneath t 1e passage 51 in the plug 48 which communicates with the chamber 41 by means of the port 50. The driving shaft 28 may be driven from a moving part havine' a changeable speed, with the result that tlie speed of the gears will be varied. This variation of the gear speed will result in a variable pressure on the output side ofthe gears. When the pressure in the chamber`4l exceeds the tension of the spring 43 the valve 45 will be opened, allowing such fluid to by-pass to the tank 34 through the pipe 47. In this manner a constant maximum head pressure is maintained in the chamber 41 above the piston 45 carrying the gear 30, and such maximum head pressure can be varied by manipulation of the plug 46. IVhen the pressure in the chamber 15 is greater than that of the set maximum head pressure, the piston will be moved upwardly carrying the gear 30 into substantially full meshed relation with the gear 29. iVhen the pressure in the chamber 15 becomes less than the set maximum head pressure in the chamber 41, the piston and the gear will be moved downwardly into relativel unmeshed relation with the gear 29. It will thus be seen that the gear 30 and its carrier are balanced hydraulically to control the delivered output.

When the teeth of the gears 29 and 30 are in full mesh, fluid is not permitted to pass to the port 20, but instead must pass upwardly through ports 51 and 50 to the chamber 41 decreasing the fluid supply moved to the chamber 15 from the gear 29 and thereby reducing the pressure until the pressures in the chambers are balanced.I When the gear 30 is moved axially so that it meshes with only a portion of the gear 29, the grooved or cut-away portion 49 of the piston head 38 is brought into registering position with the upper portion of the gear 29 (Fig. 4), so that fluid can be carried by the teeth of the gear through the grooved portion to port 2U -through which it is carried to the chamber 15, and therefore the fluid passing to the chamber 15 and the gear 27 is augmented by that flowing from the gear 29 thereby increasing the pressure on the lower face of the piston until the pressures in the chambers are again balanced.

It is well known that as the gear speed is increased, the fluid pressure and output will increase. However, with this device, the fluid output delivered through the pipe 18 will remain constant at a given setting of the plug 46 wit-hin any speed range, w1thin certain limits. This result is permitted through the movable plunger and gear, and the by-pass arrangement leading back to the tank. It will also be seen that by changing the tension of the spring 43, the delivered pump output can be varied, because the head pressure or hydraulic balance will be varied, resulting in movement of the plunger and gear 30 which will allow more or less of the fiuid from the gear 29 to pass to the port 20 or back to the tank through the chamber 41.

In Figures 6, 7, 8, and 9, I have shown a modified form of the invention, wherein the capacity of the pump is fixed or set by adjusting the piston 35 to retain the gear 30 in fixed relation to the gear 29. In this forni, the return port 51 is connected by a passage 52 to the inlet 31, so that any quantity of liquid or fluid over and above the predetermined desired delivered output of the pump at a given speed may be returned to the inlet, or in other words, is by-passed from the return port to the inlet port.

As shown, in this modification, the piston 35 has oppositely extending shafts 53 and 54; one of which, the shaft 53, has positioned thereon a plug 55 provided with a cut-away portion 56 substantially the same as the cutaway portion in the piston head 38 in the preferred form. This plug is secured on the shaft 53 by a nut 57 threaded on the end of the shaft. The shaft 54 has threaded thereon Y10.' modification. in the casing, an in et leadin into t e cas- -65 6. A pump comprising a plurality of iiimember.

Lamine 3 asleeve 58 havingalange 59towhchiske ed termeshing gears, one of which is slidably a suitable nut 6 with a portion of the ate movable to vary the delivered output of the 13 interposed between the flan e 59 an the pump roportionate to the movement of the nut 60, so that u on turning t e nut 60, the gear, t e output being increased as the gear plunger 35V may reciprocated, manually to is moved in a direction tending to disengage y lvar the position of the gear 30 with respect the gear and decreased when the gear is m to t e gear 29 and to thereby change the maxmoved in the direction tending to align the imum delivered output of the pump at any gears. given speed, it being understood thatvaria- 7. Ina variable output capacit pump, a tions in speed will vary this output in this casing, apair of co-o erating impe lin gears Although the invention has been described ing, an outlet leading from t e casing, said in connection with certain specific embodicasing having a duct leading from one of ments, the principles involved are susceptthe impelling gear chambers to the outlet, ble to numerous other applications, as will and means comprising a movable flow conl readily occur to rsons sk1lled in.the art. trolling gear for connecting the other im- The invention is, t erefore, to be limited only pellin gear chamber with the outlet. as indicated by the scope of the appended 8. I a, gear pump, automatic hydraulio claims. differential pressure operated means includ- Having thus described the various features ing an axiall movable gear for maintaining 3 of my invention, what I claim as new and dea constant de ivered output tlirou hout a lmsire to secure b Letters Patent isz ited range of operating speeds, an adjustable 1, In a varia 1e output capacity pump, -8 means for determining the maximum output casing having fixed intake and delivery oricapacity of the pump including means for fices, a pair of impellmg gears nl the CRS- by-passing fluid in excess of said constant d ing, said casing having a duct leading from output, 011B 0f the geil!! chambers t0 the Outlet, means 9, In a, Pump., a, casing having fixed intake for connecting the other gear chamber with and delivery orifices, impelling means in said the outlet, and means for controlling the volcasing, and automatic means including an uxne of fluid passing from the last mentioned pumping elements movable with respect to 95 gear chamber to the outleteach other and automatic means for moving 2. A pump com rising a tram Q gears, the pumping elements in response to changes means for drivingt egears, automatic means in pressure for maintaining a constant outoperative in response to changes 1n the pljeS- put through the deliver orifice throughout Sure of the fluid belllg umped fOr mOVlIlg a range of variable impeller operating speeds 10; 011e 0f the geaI'S t0 Vary t C de Iee 0f engageand by-pass means for the fiuid in excess of ment with another gear direc y with the rate Said coni-,ant output, of rotation of the gears to maintain a con- 10, In pump a casing having fixed intake Stunt Output Within a llmted OPBIftn T ng and delivery orifices, impelling means in said 0f Speed, and means OI luy-Passing llld 111 casing, and automatically operative means i n 105 excess of Said consta?? Outputcluding an axially movable gear for main- ?qA Pum eompnsmg tram 0f gears, a taining a constant output through the dednvmg ,Sha t'cmnected t0 one 0f the gears livery orifice throughout a portion of a varimtomtlc pressie Operatedmeans for, movable impeller operating speed and means for mg one 0f the gears t0 regulate the dhvfed by-passiiig fiuid in excess of said constant outno Voutput of the pump, and means for adjustput ing the PleSsure Operated means mcludlng 11. In a pump, a casing having fixed inbyPaSS- take and delivery orifices, impelling means in 4 A Pum compl'lsmg a mlm 0f gears a said casing, and hydraulically controlled reldriving sha connected t0 one 0f the gearsa atively movable pumping elements for mainn l movable carriage for one 0f the gears, dlftainin a constant output through the delivfel-enti al pressure operated means controlery orifice throughout a (portion of a variable ling the movement of the carriage, and autoimpeller operating spee and by-pass means matic means associated with said carriage for the fluid impelled in excess of said conan for regulating the pressure means including stant output. -I

a by-pass for returning fluid to the pump. 12. In a pump, a. casing having fluid in- 5. A tluidpump comprising a plurality of take and deliveryprifces, relatively movable intermeshing gears, a reciprocable diferenimpelling means in said casing, an automattial piston operated by the fluid pressure, one ically o erable floating control member in the 60 of said ars being secured to said piston and casing or controlling the position of the rellilil therebygleng movable axially to increase the atively movable impelling means for deterdelivered output of the pump proportionate mining the delivered output, and adjustable to the distance moved from alignment with fiuid by-pass' means for automaticall re the other gears. lating the normal position of said oatignug 13. Ina pump, a casing havin an intake and a delivery orifice, movable uid impelling means in said casing for varying the capacity of the pump, and an automatically operative hvdraulically balanced control member in t e casing for moving the iiuid impelling means for determining the deliv. ered output and adjustable by-pass means for automatically regulating the normal position of said control member.

14. In a pump, a casing having fixed intake and delivery orifices, variable capacity pumping elements within the casing, an automat-ically operative hydraulically balanced flow controlling member for controlling the variable capacity pumping elements for controlling the volume of iiuld flowing through the delivery orifice, and manually adjustable means including a by-pass for varying the lgglanced position of said flow control mem:

r. 15. In a fluid pump, a casing having inlet and outlet orifices and a chamber therein, a differential piston reciprocable in the chamber by the force of differential pressures thereon, and gearing in the casing for im- Eelling fluid therethrough, one of said gears eing movable by the iston to maintain a constant fluid output within a limited range of operating speed of said gearing and bypass means for the fiuid in excess of said constant output.

16. A pump comprising pumping elements adapted for movement with respect to each other to vary the pump output, a recprocable member operated hydraulically to control the position of the pumping elements to maintain a constant delivered output within a limited variation in the rate of operation of the pump, and automatic means for controlling the movement of the reciprocable member including means for by-passing iiuid in excess of said constant delivered output.

In testimony whereof I aiix my signature.

WILLIAM CARL HARBISON.

CERTIFICATE OF CORRECTION.

Patent No. 1,879,219. -September 27, 1932.

WILLIAM CARL HARRISON.

lt is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 3, line 114, claim ll, after "and" insert the wordsy"automatical1y operative"; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 28th day oi March, A. D. .1933.

Acting Coiiinia'ambf Patents.

(Seal) 13. Ina pump, a casing havin an intake and a delivery orifice, movable uid impelling means in said casing for varying the capacity of the pump, and an automatically operative hvdraulically balanced control member in t e casing for moving the iiuid impelling means for determining the deliv. ered output and adjustable by-pass means for automatically regulating the normal position of said control member.

14. In a pump, a casing having fixed intake and delivery orifices, variable capacity pumping elements within the casing, an automat-ically operative hydraulically balanced flow controlling member for controlling the variable capacity pumping elements for controlling the volume of iiuld flowing through the delivery orifice, and manually adjustable means including a by-pass for varying the lgglanced position of said flow control mem:

r. 15. In a fluid pump, a casing having inlet and outlet orifices and a chamber therein, a differential piston reciprocable in the chamber by the force of differential pressures thereon, and gearing in the casing for im- Eelling fluid therethrough, one of said gears eing movable by the iston to maintain a constant fluid output within a limited range of operating speed of said gearing and bypass means for the fiuid in excess of said constant output.

16. A pump comprising pumping elements adapted for movement with respect to each other to vary the pump output, a recprocable member operated hydraulically to control the position of the pumping elements to maintain a constant delivered output within a limited variation in the rate of operation of the pump, and automatic means for controlling the movement of the reciprocable member including means for by-passing iiuid in excess of said constant delivered output.

In testimony whereof I aiix my signature.

WILLIAM CARL HARBISON.

CERTIFICATE OF CORRECTION.

Patent No. 1,879,219. -September 27, 1932.

WILLIAM CARL HARRISON.

lt is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 3, line 114, claim ll, after "and" insert the wordsy"automatical1y operative"; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 28th day oi March, A. D. .1933.

Acting Coiiinia'ambf Patents.

(Seal) 

